Arrangement for equalizing the tension of two supplied threads

ABSTRACT

First and second threads, the tensions of which must be equalized, are fed to their place of processing from respective first and second storage bobbins provided with braking discs over rotating rollers situated on a bridge capable of oscillation. The increased pull of the first thread in case of an increased tension therein causes the bridge to be displaced, whereby a larger braking force is generated for taking off the second thread from its respective bobbin, and the braking force for the first bobbin is reduced.

United States Patent [1 1 Kovar et al.

[451 Dec. 9, 1975 ARRANGEMENT FOR EQUALIZING THE FOREIGN PATENTS ORAPPLICATIONS TENSION OF Two SUPPLIED ADS 1,062,299 7/1959 Germany242/156 [75] Inventors: Stanislav Kovar; Jiri Cemocky; Petr Riha, all ofVsetin, Czechoslovakia [73] Assignee: Zbrojovka Vsetin, narodni podnik,Primary Exammer stanley Gllreath Vsetin, Czechoslovakia [22] Filed: May7, 1974 ABS CT [21] Appl. No.: 467,665

First and second threads, the tensions of which must be e ualized arefed to their lace of rocessin from 30 F q r P P orelgn Apphcauon i Datarespective first and second storage bobbins provided May 7, 1973Czechoslovakia 3230-73 with braking discs Over rotating rollers situatedon a bridge capable of oscillation. The increased pull of the [g2] }I.S.Cll 242/156, 242/156.2 first thread in Case of an increased tensiontherein Flilt. C causes the to be displaced whereby a larger [5 leld ofSearch 242/156, 156.2, 42, 75.4, braking force is generated for takingOff the second 242/75'41 7543 thread from its respective bobbin, and thebraking d. References Cited force for the first bobbin 1S reduce UNITEDSTATES PATENTS 4 Claim, 3 Drawing Figures 3,089,665 5/1963 Gardner, Jr242/156 a fa 4 I l l l l I l l I I I l l 1 I US. Patent Dec. 9, 1975Sheet 1 of2 3,924,820

\l ll LAX/MAW l. M $1M US. Patent Dec. 9, 1975 Sheet 2 of2 3,924,820

ARRANGEMENT FOR EQUALIZING THE TENSION OF TWO SUPPLIED THREADSBACKGROUND OF THE INVENTION The invention relates to an arrangement forequalizing the tension of two supplied threads and is particularlysuitable for use in apparatus for supplying binding threads to a devicefor reinforcing the borders of a fabric by a leno weave.

In most of the arrangements for reinforcing the borders of a fabric byleno threads the tension of each binding thread is adjustedindividually. The adjustment of two compensation means in order toachieve an equal tension of both binding threads is rather difficult anddepends substantially on the feel and the experience of the attendant.The requirement of an equal relative tension of both binding threads isa major require; ment in the course of forming a leno weave, and thequality of the binding of the border of the fabric and its appearancedepend thereon. An unequal tension of binding threads causes also theirunequal consumption.

SUMMARY OF THE INVENTION It is an object of this invention to provide anarrangement which automatically equalizes the relative tensions of bothsupplied threads, thus enabling a better binding of the border of thefabric and improving the quality of the fabric. It is another object toprovide an arrangement which is simple and easy to manufacture.

The arrangement according to this invention has two bobbins, supportedon rotatable center rods arranged on a supporting disc, the bobbinsbeing connected to the brake disc pins inserted into the faces ofbraking discs. When the binding threads are taken off from the bobbins,the bobbins, and therefore also the binding threads, are braked by wiresencompassing the respective braking disc and disposed in circumferentialgrooves therein. The first ends of both wires are together anchored on ahook shaped arm of a lever, the other arm of which cooperates by way ofa neck formed on a screw head with oscillatable bridge. A guiding rolleris arranged on the bridge on each side of an imaginary straightdirection of both binding threads in a distance differing at the placeof contact of the binding threads with the guiding rollers from thedistance of both binding threads at their imaginary straight directiontoward the outlet eyelets. The oscillating bridge is supported on atleast two flat springs to move within a plane parallel with both planesin which the threads move in the course of their passage around theguiding and drawing-in rollers. A pull spring is inserted between oneend of each wire and its anchor thereby securing a constant tension ofthe wire.

The major advantage of the arrangement for equalizing the tension of twobinding threads according to this invention is that it secures an equalrelative tension of one thread with respect to the second thread,securing thus a better binding and quality of the border of the fabric.The space required for housing the compensation means is relativelysmall. The whole arrangement is simple and is easy to manufacture.

DESCRIPTION OF THE DRAWINGS An exemplary embodiment of the object ofthis invention is shown in the attached drawing, wherein:

FIG. 1 is an elevation in partial section of the arrangement of theinvention showing the guiding of the binding threads from the bobbins tothe outlet eyelets;

FIG. 2 is a plan view of the whole arrangement; and

FIG. 3 is a view partially in section and partially in elevation of therotatable support of a bobbin, the section being taken along line 3-3 inFIG. 2.

DESCRIPTION OF THE PREFERRED EMBODIMENT An exemplary embodiment of theobject of the invention is shown in the attached drawing, wherein thearrangement of the invention comprises a disc 1 supporting rotatablebraking discs 2 and 3. As shown in FIG. 3, a rod 4 is inserted in thebraking disc 2 to support and guide the bobbin 6, the bobbin and rodwith the braking disc 2 being supported in antifriction bearings andturning together when taking off the binding thread 7. A pin 5 connectsthe bobbin 6 to the braking disc 2 to insure their joint rotation. Thesecond bobbin 8 carrying binding thread 9 is similarly constructed andsupported.

A wire 11 encompasses a part of the circumference of the braking disc 2lying in a groove 10 therein, the wire 11 is fixed at one of its ends toa hook shaped arm 12 of a lever 20, and is connected at its other endwith a coil tension spring 13, which is suspended on a hook 14 of anadjustable anchoring means 15 provided with a position adjusting setscrew 16 and a fastening screw 17. A wire 18 is similarly arranged onthe braking disc 3, and is anchored at one end. on a hook 14 andconnected at its other end to a coil tension spring 19 which issuspended on the hook shaped arm 12 of the lever 20. Lever 20 in turn ispivotally supported on a stub shaft 21 fixed on the supporting disc 1.

The second arm 22 of the lever 20 forms a fork, engaging into the neck23 of the head of the screw 24, by means of which the end of a flatspring 26 is tightened to the bridge 27 through a washer 25, a secondflat spring 28 being fixed to the bridge 27 by a screw 29 and washer onits opposite side. The lower ends of the flat springs 26 and 28 arefixed to a strap piece 30 by screws 31. The strap piece 30 is firmlyconnected with the supporting disc 1 by screws 32. A holder 34 forthread guiding eyelet 35 and 36 is fixed at the center of the uppersurface of the bridge 27 by a screw 33. Guiding rollers 37 and 38 areprovided on the opposite sides of the bridge 27, both rollers beingrotatably supported on stub shafts 39 and 40 fixed to the bridge 7.Rollers 41 and 42 for drawing-in the binding threads 7 and 9 to theoutlet eyelets 43 and 44 are also rotatably supported on each side ofthe strap plate 30.

The binding threads 7 and 9, which are supplied by the feeding eyelets35 and 36 from bobbins 6 and 8, are brought to the circumference ofguiding rollers 37 and 38 and further guided to the circumference of thedrawing-in rollers 41 and 42 by means of which they are drawn to theoutlet eyelets 43 and 44, from which they are taken off and brought tothe working site.

The arrangement operates so that in case of an increase of tension ofone of the binding threads, for instance, of thread 9 on bobbin 8, thebridge 27 supported on delicate flat springs 26 and 28 deviates due tothe increased pull of the binding thread 9 on the guiding roller 37 tothe right, thus causing the head of the screw 24 with the neck 23 alsoto move to the right, thereby turning the fork of the arm 22 of thelever 20. Thus the hook-shaped arm 12 of the lever 20 is also turned,reducing the pull upon the wire 18 and accordingly reducing the brakingforce which brakes the bobbin 8, thereby causing a reduction of thetension of the binding thread 9. Since the wire 11 for braking thebobbin 6 carrying the binding thread 7 is fixed on the same hook-shapedarm 12 of the lever 20, the tension in wire 11 increases in case of thedeviation of the hookshaped arm 12 to the right, thereby increasing thebraking force imposed upon bobbin 6 and increasing the tension of thebinding thread 7. The tensions of both binding threads 7 and 9 arequickly equalized and maintained at relatively equal values. This fullysatisfies those cases wherein it is required that the difference oftensions of two binding threads should be a minimum, even if theresulting tension of the two threads varies, as it is the case, forinstance in the application of a leno weave for reinforcing the borderof a fabric.

The arrangement according to this invention can be applied to caseswhere an equal relative tension of two threads is required, and isparticularly suitable for reinforcing of borders of fabrics by a lenoweave.

Although the invention is illustrated and described with reference toone preferred embodiment thereof, it is to be expressly understood thatit is in no way limited by the disclosure of such a preferredembodiment, but is capable of numerous modifications within the scope ofthe appended claims.

What is claimed is:

1. Arrangement for equalizing the tension of two supplied threads takenoff from individual bobbins, comprising in combination a frame, twothread-carrying bobbins rotatably supported on the frame, a groovedbraking disc affixed to each bobbin, braking wires received within thegrooves of the respective bobbins, an-

choring means for one end of each braking wire affixed to the frame, atwo-arm lever rotatably supported on the frame, one arm of said leverserving as an anchoring means for the second ends of both braking wires,a tension spring inserted in one end of each braking wire, a bridgesupported for oscillation on the frame, a guiding roller for each threadon opposite sides of said bridge, a drawing-in roller for each thread ona support affixed to the frame, outlet eyelets for the thread fixed onthe said support, and means pivotally connecting the bridge to thesecond arm of the lever so that turning of the lever in one direction bythe movement of the bridge in a first direction increases the brakingeffect of a first wire on the braking disc of the first bobbin whiledecreasing the braking effect of the second wire on the braking disc ofits respective bobbin, and turning of the lever in the other directionby the movement of the bridge in a second direction increases thebraking effect of the second wire on the braking disc of the secondbobbin while decreasing the braking effect of the first wire upon thebraking disc of the first bobbin.

2. Arrangement as in claim 1, wherein the means affixed to the frame foranchoring said one end of each braking wire include means for adjustingthe tension in said braking wires.

3. Arrangement as in claim 1, wherein the oscillating bridge issupported on the frame by mounting means including springs, saidmounting allowing a deviation of the oscillating bridge in a planeparallel with the planes in which the taken-off threads move whenpassing the guiding rollers and the drawing-in rollers.

4. Arrangements as in claim 3, wherein the mounting means includes atleast two flat springs.

1. Arrangement for equalizing the tension of two supplied threads takenoff from individual bobbins, comprising in combination a frame, twothread-carrying bobbins rotatably supported on the frame, a groovedbraking disc affixed to each bobbin, braking wires received within thegrooves of the respective bobbins, anchoring means for one end of eachbraking wire affixed to the frame, a two-arm lever rotatably supportedon the frame, one arm of said lever serving as an anchoring means forthe second ends of both braking wires, a tension spring inserted in oneend of each braking wire, a bridge supported for oscillation on theframe, a guiding roller for each thread on opposite sides of saidbridge, a drawing-in roller for each thread on a support affixed to theframe, outlet eyelets for the thread fixed on the said support, andmeans pivotally connecting the bridge to the second arm of the lever sothat turning of the lever in one direction by the movement of the bridgein a first direction increases the braking effect of a first wire on thebraking disc of the first bobbin while decreasing the braking effect ofthe second wire on the braking disc of its respective bobbin, andturning of the lever in the other direction by the movement of thebridge in a second direction increases the braking effect of the secondwire on the braking disc of the second bobbin while decreasing thebraking effect of the first wire upon the braking disc of the firstbobbin.
 2. Arrangement as in claim 1, wherein the means affixed to theframe for anchoring said one end of each braking wire include means foradjusting the tension in said braking wires.
 3. Arrangement as in claim1, wherein the oscillating bridge is supported on the frame by mountingmeans including springs, said mounting allowing a deviation of theoscillating bridge in a plane parallel with the planes in which thetaken-off threads move when passing the guiding rollers and thedrawing-in rollers.
 4. Arrangements as in claim 3, wherein the mountingmeans includes at least two flat springs.